Summary of Personal Monitoring Data for Asbestos-Related Maintenance Work at the Lawrence Livermore National Laboratory

Transcription

1 UCRL-JC PREPRINT Summary of Personal Monitoring Data for Asbestos-Related Maintenance Work at the Lawrence Livermore National Laboratory S.M. Franaszek RJ. Kelly This paper was prepared for submittal to the American Industrial Hygiene Conference and Exposition Washington, DC May 19-24,1996 May 1996 This is a preprint of a paper intended for publication in a journal or proceedings. Since changes may be made before publication, this preprint is made available with the understanding that it will not be cited or reproduced without the permission of the author ,

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4 SUMMARY OF PERSONAL MONITORING DATA FOR ASBESTOS-RELATED MAINTENANCE WORK AT THE LAWRENCE LIVERMORE NATIONAL LABORATORY S. M. Franaszek, R. J. Kelly, Hazards Control Department, Lawrence Livermore National Laboratory, Livermore, CA 94551

5 solvents,, transite (cement asbestos ) work, and roofing material removal. Data ranges and mean values were calculated for all procedure description categories. These results are presented in both chart and graph form. These charts are a historical record of expos& during

6 3SB-Minute Excursion limit ( E l ) Samples 77 of the 186 reported results were 30-minute EL values. None of the results exceeded the 30 minute excursion limit of 1.0 f/cc. Eight excursion sample results (9%).approached the 30-minute Excursion Limit (N.33 f/cc or 33 % of the applicable EL). Seven of the eight samples that approached the 30 Minute Excursion Limit were in the TSI removal with Glove Bag procedure description category. One of the samples that approached the 30 minute EL was in the Decontamination operation category. Summary of 30 1 Work Category decontamination TSI/glove bag misc. gasket/insul wallboard VAT removal mastic removal transite work roofine work

7 CONCLUSIONS Work procedures which rarely resulted in significant exposures included wallboard/skimcoat removal, vinyl asbestos tile (VAT) abatement using wet methods, the removal of VAT mastic using solvents,, Transite (cement asbestos ) work, and roofing material removal Work procedures which frequently resulted in the exposures that approached or exceeded regulatory limits included Glove Bag removal of TSI, Surface Decontamination, and gasket and wire insulation removal. Glove bag removal of TSI resulted in significant exposures. 7 of 25 (28%) reported EL samples approached the regulatory limit of 1.0 f/cc. 3 of 22 (14%) reported &hour TWA's approached the PEL of 0.1 f/cc. The short duration of most glove bag jobs limited 8-hour TWA exposures. Surface decontamination resulted in significant exposures. 1 of 3 (33%) reported 30 minute EL samples approached the applicable regulatory limit of 11.0 f/cc. 1of the 28 (4%) reported TWA results exceeded the applicable regulatory limit of O.lf/cc. 8 (28%) of the reported TWA results approached 0.1 f/cc Work procedures where exposures frequently approached or exceeded regulatory limits typically involved working with materials that contain high percentage asbestos in a loose matrix. Work procedures where exposures were well below regulatory limits frequently involved working with asbestos containing materials in a tightly bound matrix. This work was performed under the auspices of the U.S.Dept. of Energy at LLNL under contract no. W-7405-Eng-48.

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